Cathy is a character mentioned in Fallout 4.
Cathy was a raider who lived in The Commonwealth. She and her partner Monty were settled in a ruined house located in Malden. She was prone to sleepwalking. Going against Monty's advice to move her bed downstairs, she died when she tripped and broke her neck while sleepwalking.
They lived in a ruined pre-war house near Old Gullet sinkhole that has a front door chained from the inside and can be entered from the sinkhole via a basement door.
Cathy is mentioned only in Fallout 4.